共用题干
Smoking can Increase Depressive Symptoms in Teens
While some teenagers may use cigarettes to "self-medicate"（自我治疗）against the blues（忧郁）,sci-
entists at the University of Toronto and the University of Montreal have found that smoking may actually
______________
(51)depressive symptoms in some teens.
"This observational study is one of the few to examine the perceived ______________(52)benefits of
smoking among teens,"says lead researcher Michael Chaiton,a research associate at the Ontario Tobacco
Research Unit of the University of Toronto."_______________(53)cigarettes may appear to have self-medicating
effects or to improve mood,in the long_______________(54)we found that teens who started to smoke reported
higher depressive symptoms."
As part of the study,some 662 high school teenagers completed up to 20 questionnaires about their use
of cigarettes to ______________
(55)mood.Secondary schools were selected to provide a mix of French and
English participants,urban and rural schools,and schools ______________(56)in high,moderate and low so-
cioeconomic neighbourhoods.
Participants were divided into three
______________ (57):never smokers;smokers who did not use ciga-
rettes to self-medicate,improve mood or physical
______________ (58);smokers who used cigarettes to self-
medicate.Depressive symptoms were measured using a scale that asked how often participants felt too tired
to do things;had
______________ (59)going to sleep or staying asleep;felt unhappy,sad,or depressed;felt
hopeless about the future;felt anxious or tense;and worried too much about things.
" Smokers who used cigarettes as mood
______________( 60 ) had higher risks of elevated（提升）depres-
sive symptoms______________ (61)teens who had never smoked,"says co-researcher Jennifer O'Loughlin,a
professor at the University of Montreal Department of Social and Preventive Medicine."Our study found that
teen smokers who reported emotional benefits from smoking are_______________(62)higher risk of developing
depressive symptoms."
The______________ (63)between depression and'smoking exists______________(64)among teens that use
cigarettes to feel better."It's ______________(65)to emphasize that depressive symptom scores were higher
among teenagers who reported emotional benefits from smoking after they began to smoke,"says Dr. Chaiton.
_________(51)
A:diagnose
B:increase
C:examine
D:treat
Smoking can Increase Depressive Symptoms in Teens
While some teenagers may use cigarettes to "self-medicate"（自我治疗）against the blues（忧郁）,sci-
entists at the University of Toronto and the University of Montreal have found that smoking may actually
______________
(51)depressive symptoms in some teens.
"This observational study is one of the few to examine the perceived ______________(52)benefits of
smoking among teens,"says lead researcher Michael Chaiton,a research associate at the Ontario Tobacco
Research Unit of the University of Toronto."_______________(53)cigarettes may appear to have self-medicating
effects or to improve mood,in the long_______________(54)we found that teens who started to smoke reported
higher depressive symptoms."
As part of the study,some 662 high school teenagers completed up to 20 questionnaires about their use
of cigarettes to ______________
(55)mood.Secondary schools were selected to provide a mix of French and
English participants,urban and rural schools,and schools ______________(56)in high,moderate and low so-
cioeconomic neighbourhoods.
Participants were divided into three
______________ (57):never smokers;smokers who did not use ciga-
rettes to self-medicate,improve mood or physical
______________ (58);smokers who used cigarettes to self-
medicate.Depressive symptoms were measured using a scale that asked how often participants felt too tired
to do things;had
______________ (59)going to sleep or staying asleep;felt unhappy,sad,or depressed;felt
hopeless about the future;felt anxious or tense;and worried too much about things.
" Smokers who used cigarettes as mood
______________( 60 ) had higher risks of elevated（提升）depres-
sive symptoms______________ (61)teens who had never smoked,"says co-researcher Jennifer O'Loughlin,a
professor at the University of Montreal Department of Social and Preventive Medicine."Our study found that
teen smokers who reported emotional benefits from smoking are_______________(62)higher risk of developing
depressive symptoms."
The______________ (63)between depression and'smoking exists______________(64)among teens that use
cigarettes to feel better."It's ______________(65)to emphasize that depressive symptom scores were higher
among teenagers who reported emotional benefits from smoking after they began to smoke,"says Dr. Chaiton.
_________(51)
A:diagnose
B:increase
C:examine
D:treat
共用题干
Breakfast
Studies show that children who eat breakfast do better in school.It doesn't take much
further thought to believe that adults will feel better and perform better at work as well.
Whether you work at home,on the farm,at the office,at school,or on the road,it is not
a good idea to skip（故意略去）breakfast.
If we don't eat breakfast,we are likely to become tired when our brains and bodies run
low on fuel.By mid-morning,a lot of us grab a cup of coffee,or wolf down a sugary candy
bar to wake up again.This might work for a few minutes,but by lunchtime we are hungry,
bad-tempered,and perhaps our mood might make us a little more likely to make unhealthy
choices at lunch.Eating a good breakfast sets the tone for the rest of the day.
People who eat breakfast are generally more likely to maintain a healthy weight.Many
people believe that they will lose weight if they skip meals,but that isn't a good idea.The
body expects to be refueled a few times a day, so start with a healthy breakfast.
A healthy breakfast should contain some protein（蛋白质）and some fiber（纤维）.Protein
can come from meat,eggs,beans,or soy（大豆）.Fiber can be found in whole cereals（谷
物）,grains or in fruits.A good example of a healthy breakfast might be something simple
like a hard boiled egg,an orange,and a bowl of whole grain cereal with soy milk.
Adults who eat breakfast will perform better at work.
A:Right
B:Wrong
C:Not mentioned
Breakfast
Studies show that children who eat breakfast do better in school.It doesn't take much
further thought to believe that adults will feel better and perform better at work as well.
Whether you work at home,on the farm,at the office,at school,or on the road,it is not
a good idea to skip（故意略去）breakfast.
If we don't eat breakfast,we are likely to become tired when our brains and bodies run
low on fuel.By mid-morning,a lot of us grab a cup of coffee,or wolf down a sugary candy
bar to wake up again.This might work for a few minutes,but by lunchtime we are hungry,
bad-tempered,and perhaps our mood might make us a little more likely to make unhealthy
choices at lunch.Eating a good breakfast sets the tone for the rest of the day.
People who eat breakfast are generally more likely to maintain a healthy weight.Many
people believe that they will lose weight if they skip meals,but that isn't a good idea.The
body expects to be refueled a few times a day, so start with a healthy breakfast.
A healthy breakfast should contain some protein（蛋白质）and some fiber（纤维）.Protein
can come from meat,eggs,beans,or soy（大豆）.Fiber can be found in whole cereals（谷
物）,grains or in fruits.A good example of a healthy breakfast might be something simple
like a hard boiled egg,an orange,and a bowl of whole grain cereal with soy milk.
Adults who eat breakfast will perform better at work.
A:Right
B:Wrong
C:Not mentioned
共用题干
第二篇
As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.
The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.
The first paragraph implies that_________.
A:good health is more than not being ill
B:sleeping a lot could be harmful
C:regular health checks are essential to keeping fit
D:prevention is more difficult than care
第二篇
As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.
The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.
The first paragraph implies that_________.
A:good health is more than not being ill
B:sleeping a lot could be harmful
C:regular health checks are essential to keeping fit
D:prevention is more difficult than care
共用题干
Lifetime Employment in Japanese Companies
In most large Japanese companies,there is a policy of lifetime employment.What this means is that when people leave school or university to join an enterprise,they can expect to remain with that organization until they retire.In effect,the employee gets job security for life,and can only be fired for serious mistakes in work.Even in times of business recession,he or she is free from the fear of being laid off.
One result of this practice is that the Japanese worker identifies closely with his company and feels strong loyalty to it.By working hard for the company,he believes he is safeguarding his own future.It is not surprising that devotion to one's company is considered a great virtue in Japan.A man is often prepared to put his firm's interests before those of his immediate family.
The job security guaranteed by this system influences the way employees approach their work.They tend to think in terms of what they can achieve throughout their career.This is because they are not judged on how they are performing during a short period of time.They can afford to take a longer perspective than their western counterparts.
This marriage between the employee and the company-the consequence of lifetime employment-may explain why Japanese workers seem positively to love the products their company is producing and why they are willing to stay on after work,for little overtime pay,to participate in earnest discussions about the quality control of their products.
Lifetime employment in the Japanese company perhaps means that the employee can make serious mistakes in work.
A:Right
B:Wrong
C:Not mentioned
Lifetime Employment in Japanese Companies
In most large Japanese companies,there is a policy of lifetime employment.What this means is that when people leave school or university to join an enterprise,they can expect to remain with that organization until they retire.In effect,the employee gets job security for life,and can only be fired for serious mistakes in work.Even in times of business recession,he or she is free from the fear of being laid off.
One result of this practice is that the Japanese worker identifies closely with his company and feels strong loyalty to it.By working hard for the company,he believes he is safeguarding his own future.It is not surprising that devotion to one's company is considered a great virtue in Japan.A man is often prepared to put his firm's interests before those of his immediate family.
The job security guaranteed by this system influences the way employees approach their work.They tend to think in terms of what they can achieve throughout their career.This is because they are not judged on how they are performing during a short period of time.They can afford to take a longer perspective than their western counterparts.
This marriage between the employee and the company-the consequence of lifetime employment-may explain why Japanese workers seem positively to love the products their company is producing and why they are willing to stay on after work,for little overtime pay,to participate in earnest discussions about the quality control of their products.
Lifetime employment in the Japanese company perhaps means that the employee can make serious mistakes in work.
A:Right
B:Wrong
C:Not mentioned
共用题干
Water and its importance to human life were the center of the world's attention last week. March 22 was World Water Day and______(51)the theme"Water for Life”.
There are more than one billion people in the world who live without______(52)drinking water. The United Nations______(53)to cut this number in half by 2015.
Solving such a big problem seems like a(n)______(54)challenge.But everyone,even teenagers,can do something to help.A teenage girl in the US has set an example to the______(55)of her age around the world.
Rene Haggerty,13,was awarded the 2004 Gloria Barron Prize for her work—_______(56) discarded（废弃的）batteries（电池）which pollute water.
In 2003,Haggerty went on a field trip to the Great Lakes Science Centre in Ohio.There she saw an exhibit about how______(57)in old batteries harm the water of Lake Erie.
Haggerty learnt that______(58)the batteries was an easy solution."I think everybody can do it,because everyone uses batteries,and it can make a big difference."With these words,she began to.______(59)awareness in her area.
She______(60)her county government and school board. She got permission to start a re-cycling program in schools,hospital,churches______(61)the public library. With the help from her family,friends and local waste-management______(62),she gathered containers,arranged transportation,and made an educational video.
Over the past two years,she collected four tons of batteries and drew the attention of officials, who were in charge of a battery recycling program but had made______(63)progress.
When asked______(64)she feels like a hero,Haggerty is quite modest."Not really. Well,maybe for the fish I saved!"
Every year the Gloria Barron Prize is______(65)to young Americans aged 8 to 1 8 who have shown leadership and courage in serving the public and the planet. Each year ten winners receive US MYM 2,000 each,to help with their education costs or their public service work.
_________(64)
A:if
B:how
C:when
D:why
Water and its importance to human life were the center of the world's attention last week. March 22 was World Water Day and______(51)the theme"Water for Life”.
There are more than one billion people in the world who live without______(52)drinking water. The United Nations______(53)to cut this number in half by 2015.
Solving such a big problem seems like a(n)______(54)challenge.But everyone,even teenagers,can do something to help.A teenage girl in the US has set an example to the______(55)of her age around the world.
Rene Haggerty,13,was awarded the 2004 Gloria Barron Prize for her work—_______(56) discarded（废弃的）batteries（电池）which pollute water.
In 2003,Haggerty went on a field trip to the Great Lakes Science Centre in Ohio.There she saw an exhibit about how______(57)in old batteries harm the water of Lake Erie.
Haggerty learnt that______(58)the batteries was an easy solution."I think everybody can do it,because everyone uses batteries,and it can make a big difference."With these words,she began to.______(59)awareness in her area.
She______(60)her county government and school board. She got permission to start a re-cycling program in schools,hospital,churches______(61)the public library. With the help from her family,friends and local waste-management______(62),she gathered containers,arranged transportation,and made an educational video.
Over the past two years,she collected four tons of batteries and drew the attention of officials, who were in charge of a battery recycling program but had made______(63)progress.
When asked______(64)she feels like a hero,Haggerty is quite modest."Not really. Well,maybe for the fish I saved!"
Every year the Gloria Barron Prize is______(65)to young Americans aged 8 to 1 8 who have shown leadership and courage in serving the public and the planet. Each year ten winners receive US MYM 2,000 each,to help with their education costs or their public service work.
_________(64)
A:if
B:how
C:when
D:why
We cannot existwithout air,food or water.
A: expand
B: rise
C: live
D: quit
A: expand
B: rise
C: live
D: quit
Many cities have restricted smoking in public places.
A:limited
B:allowed
C:stopped
D:kept
A:limited
B:allowed
C:stopped
D:kept
共用题干
Solar Storm
At the end of October 2003,a sudden solar storm hit the earth.Asolar storm refers to
the large amounts of charged particles released into space_________(1)the solar energy
increases.The release of the energy_________(2)place along with the activity of the
sunspots with a cycle of 11 years.This time,the_________(3)of the storm exceeded
expectations.
This_________(4)of intense solar storm was caused by the eruption of a solar flare
（闪光）and the ejection（喷发）of the solar corona（日冠）on October28, 2003. Large
amounts of charged particles moved 150, 000,000 kilometers through space toward the
_________(5)in 19 hours. They could affect aircraft roaming（漫游）in space.
The high-energy particles will_________(6)some of the parts of an aircraft.They
may also cause it to fail.High-energy particles can threaten the safety of an aircraft at a
high orbit.If an aircraft orbits at a lower orbit,it is_________(7)because it is under the
protection of the earth's magnetic field.
Asolar storm not only affects aircraft but also is a_________(8)to the environment
and humans.The aerosphere and magnetic field of the earth can_________(9)humans
from ultraviolet radiation and X-rays. While most of the X-rays are absorbed after they enter
the aerosphere（大气层）,still a few can_________(10) the ground.
The geomagnetic storm caused by this round of solar storm reaches its highest level on
the two_________(11)of the earth,which affects electricity supply of North America.
Overexposure to_________(12)threatens the health of passengers on planes flying over
the Polar Regions.If we fly in the sky during such a solar storm,it_________(13)we
receive ten times the X-ray radiation.It's really damaging.
Scientists say a solar eruption is like the sun sneezing,which will make the earth
_________(14)a cold.Though this natural force is irresistible,scientists can still
_________(15)its movement accurately by monitoring.Facing successive solar storms,
humans can't drop their guard.
_________(7)
A:safe
B:dangerous
C:comfortable
D:manageable
Solar Storm
At the end of October 2003,a sudden solar storm hit the earth.Asolar storm refers to
the large amounts of charged particles released into space_________(1)the solar energy
increases.The release of the energy_________(2)place along with the activity of the
sunspots with a cycle of 11 years.This time,the_________(3)of the storm exceeded
expectations.
This_________(4)of intense solar storm was caused by the eruption of a solar flare
（闪光）and the ejection（喷发）of the solar corona（日冠）on October28, 2003. Large
amounts of charged particles moved 150, 000,000 kilometers through space toward the
_________(5)in 19 hours. They could affect aircraft roaming（漫游）in space.
The high-energy particles will_________(6)some of the parts of an aircraft.They
may also cause it to fail.High-energy particles can threaten the safety of an aircraft at a
high orbit.If an aircraft orbits at a lower orbit,it is_________(7)because it is under the
protection of the earth's magnetic field.
Asolar storm not only affects aircraft but also is a_________(8)to the environment
and humans.The aerosphere and magnetic field of the earth can_________(9)humans
from ultraviolet radiation and X-rays. While most of the X-rays are absorbed after they enter
the aerosphere（大气层）,still a few can_________(10) the ground.
The geomagnetic storm caused by this round of solar storm reaches its highest level on
the two_________(11)of the earth,which affects electricity supply of North America.
Overexposure to_________(12)threatens the health of passengers on planes flying over
the Polar Regions.If we fly in the sky during such a solar storm,it_________(13)we
receive ten times the X-ray radiation.It's really damaging.
Scientists say a solar eruption is like the sun sneezing,which will make the earth
_________(14)a cold.Though this natural force is irresistible,scientists can still
_________(15)its movement accurately by monitoring.Facing successive solar storms,
humans can't drop their guard.
_________(7)
A:safe
B:dangerous
C:comfortable
D:manageable
共用题干
Ha!The Sdence of When We Laugh and Why
It's certainly possible to over-analyze a joke._______(46)Considering the abundant research on the topic,maybe not.
Scott Weems,a neuroscientist,takes readers on a wide-ranging tour that explains what humor is and why readers should care.______(47)Humor improves interpersonal relationships,and studies show that simply watching a funny movie can lower stress,improve immune system response and even help viewers better solve problems.
The complexity of the human brain makes humor possible,Weems argues,and it also helps explain how some people can find a joke hilarious while others deem it grossly offensive.
Humor takes many forms-as many as 44 by one researcher's count-but shares certain traits and themes.From puns and riddles to slapstick（打闹剧）,humor is inherently subversive , Weems says , often treating serious subjects with frivolity（轻浮）or even rudeness.______(48) Ha ! Isn ' t a self-help guide to being funny , though a careful reader can find useful nuggets（块金） throughout?______( 49 ) Surprise helps , too , whether it ' s the incongruity（不协调）of an elephant hiding in a cherry tree or the absolute improbability of Raquel Welch and the pope ending up in the same lifeboat.
The final chapter divulges（透露）Weems's semi-successful attempt at stand-up comedy.He got a few laughs,he says,but not where he expected them. ______(50)The joke that got Weems the most laughs,and judged by one website's readers as the best in the world,is a story that he had practiced many dozens,maybe hundreds,of times.
_______(49)
A:Prisoners of war and others in dire situations,for instance,often turn to dark humor.
B:It turns out that humor influences health and social well-being in many ways.
C:The funniest jokes carry a little edginess（急躁）,but not too much.
D:But can the same be said for humor as a whole?
E:Maybe practice does make perfect.
F:Laughter is the bridge between dreams and reason,and ev6ry good bridge needs abutments.
Ha!The Sdence of When We Laugh and Why
It's certainly possible to over-analyze a joke._______(46)Considering the abundant research on the topic,maybe not.
Scott Weems,a neuroscientist,takes readers on a wide-ranging tour that explains what humor is and why readers should care.______(47)Humor improves interpersonal relationships,and studies show that simply watching a funny movie can lower stress,improve immune system response and even help viewers better solve problems.
The complexity of the human brain makes humor possible,Weems argues,and it also helps explain how some people can find a joke hilarious while others deem it grossly offensive.
Humor takes many forms-as many as 44 by one researcher's count-but shares certain traits and themes.From puns and riddles to slapstick（打闹剧）,humor is inherently subversive , Weems says , often treating serious subjects with frivolity（轻浮）or even rudeness.______(48) Ha ! Isn ' t a self-help guide to being funny , though a careful reader can find useful nuggets（块金） throughout?______( 49 ) Surprise helps , too , whether it ' s the incongruity（不协调）of an elephant hiding in a cherry tree or the absolute improbability of Raquel Welch and the pope ending up in the same lifeboat.
The final chapter divulges（透露）Weems's semi-successful attempt at stand-up comedy.He got a few laughs,he says,but not where he expected them. ______(50)The joke that got Weems the most laughs,and judged by one website's readers as the best in the world,is a story that he had practiced many dozens,maybe hundreds,of times.
_______(49)
A:Prisoners of war and others in dire situations,for instance,often turn to dark humor.
B:It turns out that humor influences health and social well-being in many ways.
C:The funniest jokes carry a little edginess（急躁）,but not too much.
D:But can the same be said for humor as a whole?
E:Maybe practice does make perfect.
F:Laughter is the bridge between dreams and reason,and ev6ry good bridge needs abutments.
Below 600 feet ocean waters range from faintly lit to completely dark.
A:inadequately
B:hardly
C:dimly
D:sufficiently
A:inadequately
B:hardly
C:dimly
D:sufficiently
共用题干
第三篇
Renewable Energy Sources
Today petroleum（石油）provides around 40% of the world's energy needs , mostly
fuelling automobiles.Coal is still used,mostly in power stations,to cover one一quarter of
our energy needs,but it is the least efficient,unhealthiest and most environmentally
damaging fossil fuel（矿物燃料）.Natural gas reserves could fill some of the gap from oil,
but reserves of that will not last into the 22nd century either. Most experts predict we will
exhaust easily accessible reserves within 50 years.Less-polluting renewable energy
sources offer a more practical long-term energy solution. "Renewable"refers to the fact t
hat these resources are not used faster than they can be replaced.
Hydroelectric（水力发电的）power is now the most common form of renewable energy,
supplying around 20%of world electricity.China's Three Gorges Dam is the largest ever.
At five times the size of the US's Hoover Dam , its 26 turbines（涡轮机）will generate the
equivalent energy of 18 coal-fired power stations.It will satisfy 3% of China's entire electricity demand.
In 2003, the first commercial power station to use tidal（潮汐的）currents in the open
sea opened in Norway. It is designed like windmill（风车）,but others take the form of
turbines.
As prices fall,wind power has become the fastest growing type of electricity generation一
quadrupling（翻两番）worldwide between 1999 and 2005. Modern wind farms consist of
turbines that generate electricity.Though it will be more expensive,there is more than
enough wind to provide the world's entire energy needs.Wind farms come in onshore and
offshore forms.They can often end up at spots of natural beauty,and are often unpopular
with residents.And turbines are not totally harmless一they can intertere with radar,alter
climate and kill sea birds.Scotland is building Europe's largest wind farm,which will power
200,000 homes.The UK's goal is to generate one-fifth of power from renewable sources,
mainly wind,by 2020.But this may cause problems,because wind is unreliable.
China's Three Gorges Dam
A:is the first hydroelectric dam in the world.
B:is of the same size as the US's Hoover Dam.
C:can generate around 3%of world electricity.
D:is the largest hydroelectric dam in the world.
第三篇
Renewable Energy Sources
Today petroleum（石油）provides around 40% of the world's energy needs , mostly
fuelling automobiles.Coal is still used,mostly in power stations,to cover one一quarter of
our energy needs,but it is the least efficient,unhealthiest and most environmentally
damaging fossil fuel（矿物燃料）.Natural gas reserves could fill some of the gap from oil,
but reserves of that will not last into the 22nd century either. Most experts predict we will
exhaust easily accessible reserves within 50 years.Less-polluting renewable energy
sources offer a more practical long-term energy solution. "Renewable"refers to the fact t
hat these resources are not used faster than they can be replaced.
Hydroelectric（水力发电的）power is now the most common form of renewable energy,
supplying around 20%of world electricity.China's Three Gorges Dam is the largest ever.
At five times the size of the US's Hoover Dam , its 26 turbines（涡轮机）will generate the
equivalent energy of 18 coal-fired power stations.It will satisfy 3% of China's entire electricity demand.
In 2003, the first commercial power station to use tidal（潮汐的）currents in the open
sea opened in Norway. It is designed like windmill（风车）,but others take the form of
turbines.
As prices fall,wind power has become the fastest growing type of electricity generation一
quadrupling（翻两番）worldwide between 1999 and 2005. Modern wind farms consist of
turbines that generate electricity.Though it will be more expensive,there is more than
enough wind to provide the world's entire energy needs.Wind farms come in onshore and
offshore forms.They can often end up at spots of natural beauty,and are often unpopular
with residents.And turbines are not totally harmless一they can intertere with radar,alter
climate and kill sea birds.Scotland is building Europe's largest wind farm,which will power
200,000 homes.The UK's goal is to generate one-fifth of power from renewable sources,
mainly wind,by 2020.But this may cause problems,because wind is unreliable.
China's Three Gorges Dam
A:is the first hydroelectric dam in the world.
B:is of the same size as the US's Hoover Dam.
C:can generate around 3%of world electricity.
D:is the largest hydroelectric dam in the world.
共用题干
First Image-recognition Software
1. Dartmouth researchers and their colleagues have created an artificial intelligence software that uses photos to locate documents on the Internet with far greater accuracy than ever before.
2. The new system,which was tested on photos and is now being applied to videos,shows for the first time that a machine learning algorithm（运算法则）for image recognition and retrieval is ac-curate and efficient enough to improve large-scale document searches online.The system uses pix- el（像素）data in images and potentially video—rather than just text-to locate documents. It learns to recognize the pixels associated with a search phrase by studying the results from text-based image search engines. The knowledge gleaned（收集)from those results can then be ap-plied to other photos without tags or captions（图片说明）,making for more accurate document search results.
3 .“Over the last 30 years,”says Associate Professor Lorenzo Torresani,a co-author of the stud-
“the Web has evolved from a small collection of mostly text documents to a modern,massive, fast-growing multimedia data set,where nearly every page includes multiple pictures or videos. When a person looks at a Web page, he immediately gets the gist（主旨）of it by looking at the pictures in it.Yet,surprisingly,all existing popular search engines,such as Google or Bing, strip away the information contained in the photos and use exclusively the text of Web pages to perform the document retrieval. Our study is the first to show that modern machine vision systems are accurate and efficient enough to make effective use of the information contained in image pix-els to improve document search.”
The researchers designed and tested a machine vision system—a type of artificial intelligence that allows computers to learn without being explicitly programmed—that extracts semantic（语义的）information from the pixels of photos in Web pages. This information is used to enrich the description of the HTML page used by search engines for document retrieval.The researchers tested their approach using more than 600 search queries（查询）on a database of 50 million Web pa-ges.They selected the text-retrieval search engine with the best performance and modified it to make use of the additional semantic information extracted by their method from the pictures of the Web pages .They found that this produced a 30 percent improvement in precision over the original search engine purely based on text.
A:using photos
B: description of the HTML page
C: current popular search engines
D: document search
E: information in images
F: machine vision systems
First Image-recognition Software
1. Dartmouth researchers and their colleagues have created an artificial intelligence software that uses photos to locate documents on the Internet with far greater accuracy than ever before.
2. The new system,which was tested on photos and is now being applied to videos,shows for the first time that a machine learning algorithm（运算法则）for image recognition and retrieval is ac-curate and efficient enough to improve large-scale document searches online.The system uses pix- el（像素）data in images and potentially video—rather than just text-to locate documents. It learns to recognize the pixels associated with a search phrase by studying the results from text-based image search engines. The knowledge gleaned（收集)from those results can then be ap-plied to other photos without tags or captions（图片说明）,making for more accurate document search results.
3 .“Over the last 30 years,”says Associate Professor Lorenzo Torresani,a co-author of the stud-
“the Web has evolved from a small collection of mostly text documents to a modern,massive, fast-growing multimedia data set,where nearly every page includes multiple pictures or videos. When a person looks at a Web page, he immediately gets the gist（主旨）of it by looking at the pictures in it.Yet,surprisingly,all existing popular search engines,such as Google or Bing, strip away the information contained in the photos and use exclusively the text of Web pages to perform the document retrieval. Our study is the first to show that modern machine vision systems are accurate and efficient enough to make effective use of the information contained in image pix-els to improve document search.”
The researchers designed and tested a machine vision system—a type of artificial intelligence that allows computers to learn without being explicitly programmed—that extracts semantic（语义的）information from the pixels of photos in Web pages. This information is used to enrich the description of the HTML page used by search engines for document retrieval.The researchers tested their approach using more than 600 search queries（查询）on a database of 50 million Web pa-ges.They selected the text-retrieval search engine with the best performance and modified it to make use of the additional semantic information extracted by their method from the pictures of the Web pages .They found that this produced a 30 percent improvement in precision over the original search engine purely based on text.
A:using photos
B: description of the HTML page
C: current popular search engines
D: document search
E: information in images
F: machine vision systems
共用题干
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(62)
A:repairs
B: controls
C: finishes
D: disappears
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(62)
A:repairs
B: controls
C: finishes
D: disappears
There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
A:destroys
B:beats
C:maintains
D:defend
A:destroys
B:beats
C:maintains
D:defend
共用题干
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(60)
A:closes
B:breaks
C:increases
D:burns
Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(60)
A:closes
B:breaks
C:increases
D:burns